Surface Diurnal Warming In The East China Sea Derived From Satellite Remote Sensing

The sea surface diurnal warming is the result of solar radiation,turbulent mixing and sea-air heat conduction,the analysis of sea surface diurnal warming phenomenon and mechanism is important for the sea state analysis,as well as the understanding of the basic characteristics of sea area hydrology.In this paper,the regularity and influence mechanism of sea surface diurnal warming in the East China Sea are studied by using data of buoy,MODIS-Aqua,MODIS-Terra,AMSR SST(sea surface temperature)and ERA interim sea surface heat budget,sea surface wind speed,the main research results are as follows:Through the comprehensive comparison of buoy data,MODIS-Aqua,MODIS-Terra and AMSR SST data,it is found that remote sensing data can better reflect the variations of SST in short term,and the remote sensing data far from inshore region is more accurate.Furthermore,MODIS-Aqua data can comprehensively reflect the spatial distribution and temporal variation of sea surface diurnal warming,which is the better choice for the study of sea surface diurnal warming.Base on the MODIS-Aqua SST data,study about sea surface diurnal warming regularity in the East China Sea shows that,diurnal warming in the East China Sea reflects the characteristic that higher in spring and summer and lower in autumn and winter,spatial distribution of diurnal warming and depth variations region have certain dependence in shallow water.In the coastal region of East China Sea and the Taiwan Strait,the diurnal warming changes similarly,and there are two or more fluctuations every year.Distribution of the diurnal warming in the eastern part of the East China Sea is one-fluctuation(two-season style).At the same time,large diurnal warming(?T>5K)in the East China Sea is not an accidental or isolated event,but consistent and associated with diurnal warming of East China Sea in the spatial and temporal.Sea surface large diurnal warming occurred in the area where mean monthly sea surface diurnal warming was greater than 1.5K,and the multiple stage of annual sea surface large diurnal warming is similar to the high value period of sea surface diurnal warming.The analysis of the relationships between the sea surface heat budget,the wind field and the sea surface diurnal warming in the East China Sea based on the ERA interim sea surface heat budget and sea surface wind field reanalysis data,it is found that in the East China Sea,heat budget is stronger in spring and summer,weaker in autumn and winter,mostly are negative.The heat budget is related to the land-sea distribution,water depth and ocean current.In shadow water region near the shore,the heat budget is relatively large,whereas relatively small in deep water area,compared with other regions,the main area of Kuroshio loses much more heat.Distribution of wind field characterized to be strong in autumn and winter and weak in spring and summer,there is a obvious low wind field existing in the border of East China Sea and Yellow Sea(near Jeju Island),coastal areas in Ningde,Fujian,the eastern coastal region of Taiwan Island.Sea surface diurnal warming in the Taiwan Strait and the east part of East China Sea is related with sea surface heat budget and sea surface wind speed,mainly reflects in:the greater sea surface heat budget,the smaller sea surface wind speed,the greater the sea surface diurnal warming distribution range,the higher the sea surface diurnal warming,the more conducive to the sea surface large diurnal warming.The sea surface diurnal warming in the East China Sea coastal region is little affected by sea surface diurnal warming and sea surface wind speed,it is concluded that diurnal warming in the area is more influenced by topographic distribution and runoff(land climate).